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Earnings Per Share - Shares Used in Calculation of Earnings Per Share (Detail) - shares
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted-average common shares outstanding (in shares) 2,633,752   2,253,584             2,445,821 2,248,468 2,251,365 2,231,165 2,206,392
Average treasury stock shares (in shares) (386,165)   (189,530)             (386,165) (189,530) (236,399) (189,530) (189,530)
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares) 2,247,587 1,884,484 2,064,054 2,058,986 2,053,660 2,049,536 2,044,124 2,038,026 2,033,480 2,059,656 2,058,938 2,014,966 2,041,635 2,016,862
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 8,643   8,585             8,876 9,254 9,154 7,871 7,178
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) 2,256,230 1,893,345 2,072,639 2,068,313 2,062,867 2,059,561 2,052,012 2,044,564 2,039,515 2,068,532 2,068,192 2,024,120 2,049,506 2,024,040